Subnanosecond Tm:KLuW microchip laser Q-switched by a Cr:ZnS saturable absorber

Pavel Loiko; Josep Maria Serres; Xavier Mateos; Konstantin Yumashev; Anatoly Yasukevich; Valentin Petrov; Uwe Griebner; Magdalena Aguiló; Francesc Díaz

doi:10.1364/OL.40.005220

Subnanosecond Tm:KLuW microchip laser Q-switched by a Cr:ZnS saturable absorber

Pavel Loiko, Josep Maria Serres, Xavier Mateos, Konstantin Yumashev, Anatoly Yasukevich, Valentin Petrov, Uwe Griebner, Magdalena Aguiló, and Francesc Díaz

Optics Letters
Vol. 40,
Issue 22,
pp. 5220-5223
(2015)
•https://doi.org/10.1364/OL.40.005220

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Pavel Loiko, Josep Maria Serres, Xavier Mateos, Konstantin Yumashev, Anatoly Yasukevich, Valentin Petrov, Uwe Griebner, Magdalena Aguiló, and Francesc Díaz, "Subnanosecond Tm:KLuW microchip laser Q-switched by a Cr:ZnS saturable absorber," Opt. Lett. 40, 5220-5223 (2015)

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Related Topics
Table of Contents Category
- Lasers and Laser Optics
Optics & Photonics Topics
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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Lasers, diode-pumped (140.3480)
- Lasers, Q-switched (140.3540)

About this Article
History
- Original Manuscript: September 9, 2015
- Revised Manuscript: October 12, 2015
- Manuscript Accepted: October 12, 2015
- Published: November 5, 2015

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Abstract

Passive Q-switching of a compact $Tm : KLu {({WO}_{4})}_{2}$ microchip laser diode pumped at 805 nm is demonstrated with a polycrystalline ${Cr}^{2 +} : ZnS$ saturable absorber. This laser generates subnanosecond (780 ps) pulses with a pulse repetition frequency of 5.6 kHz at 1846.6 nm, the shortest pulse duration ever achieved by Q-switching of $\sim 2 μm$ lasers. The maximum average output power is 146 mW with a slope efficiency of 21% with respect to the absorbed power. This corresponds to a pulse energy of 25.6 μJ and a peak power of 32.8 kW.

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Parameter	Notation	Value
$AM : {Tm}^{3 +} : KLuW$ ^b
Absorption cross section	$σ_{abs}$	$0.82 \times 10^{- 20} {cm}^{2}$
Stimulated-emission Cross section	$σ_{SE}$	$2.58 \times 10^{- 20} {cm}^{2}$
Lifetime	$τ ({{}^{3}F}_{4})$	1.34 ms
Refractive index	$n_{A M}$	1.995
$SA : {Cr}^{2 +} : ZnS$
Ground/excited-state absorption cross section	$σ_{GSA} / σ_{ESA}$	$0.67 \times 10^{- 18} {cm}^{2} / \approx 0$
Saturation fluence	$F_{S} = h ν_{L} / σ_{GSA}$	$0.16 J / {cm}^{2}$
Recovery time	$τ ({}^{5}E)$	5 μs
Initial transmission	$T_{SA}$	74.9%
Refractive index	$n_{SA}$	2.267

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